I have a 2003 a6 Quattro 3.0 every morning hard to start once started works fine all day. sits overnight an it will take 5 minutes to 2hrs to start
Is it really cold where you are?
At 50 degrees have same problem. At 5 to 10 degrees it wont start at all .
A tune up and filter change would be my first step. Also use a good fuel system cleaner like Techron. After that you could have the cold start enrichment system checked out.
Fixed replaced coolant temp.sensor . It was a 12 dollar part. Thank You
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